Animated Movable Ball

On beginning one Ball move from Left to Right, & Second Ball move from Top to Bottom. When You Increase or Decrease The Size of Applet Window the Ball will move Automatically. Any feedback, comments would be greatly appreciated. Please vote for me if you download the code for use.



/* Instruction :- When You Increase or Decrease The Size of
Applet Window the Ball will move Automatically
*/

import java.util.*;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;

//

public class Arc extends Applet implements Runnable
{
Random r = new Random();


int x = 10, y = 10,sang1 = 0, sang2 = 0, he = 500 , wi = 500;
public void init()
{
Thread t = new Thread(this);
t.start();
}
public void run()
{
while(true)
{
try
{
repaint();
Thread.sleep(100);
if( x < wi - 100)
x += 5;
if( y < he - 100)
y += 5;
if( x > wi - 100)
x = wi - 100;
if( y > he - 100)
y = he - 100;
sang1 += 10;
sang2 += 10;
}
catch(Exception e)
{ }
}
}
public void paint(Graphics g)
{
Dimension d = getSize();
he = d.height;
wi = d.width;
g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
g.fillArc(x,20,100,100,sang1,90);
g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
g.fillArc(x,20,100,100,sang1 + 90,90);
g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
g.fillArc(x,20,100,100,sang1 + 180,90);
g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
g.fillArc(x,20,100,100,sang1 + 270,90);

g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
g.fillArc(10, y, 100, 100, sang2 ,90);
g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
g.fillArc(10,y,100,100, sang2 + 90,90);
g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
g.fillArc(10,y,100,100,sang2 + 180,90);
g.setColor(new Color(r.nextInt(255),r.nextInt(255),r.nextInt(255)));
g.fillArc(10,y,100,100,sang2 + 270,90);

}
}